Exodus 21:6-8

New Century Version

⁶ then the slave’s master must take him to God. The master is to take him to a door or doorframe and punch a hole through the slave’s ear using a sharp tool. Then the slave will serve that master all his life.

⁷ “If a man sells his daughter as a slave, the rules for setting her free are different from the rules for setting the male slaves free. ⁸ If the master wanted to marry her but then decided he was not pleased with her, he must let one of her close relatives buy her back. He has no right to sell her to foreigners, because he has treated her unfairly.